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AUSCERT External Security Bulletin Redistribution
ESB-2021.1027
USN-4888-1: ldb vulnerabilities
25 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: ldb
Publisher: Ubuntu
Operating System: Ubuntu
Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20277 CVE-2020-27840
Original Bulletin:
https://ubuntu.com/security/notices/USN-4888-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running ldb check for an updated version of the software for their
operating system.
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USN-4888-1: ldb vulnerabilities
24 March 2021
Several security issues were fixed in ldb.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o ldb - None
Details
Douglas Bagnall discovered that ldb, when used with Samba, incorrectly
handled certain LDAP attributes. A remote attacker could possibly use this
issue to cause the LDAP server to crash, resulting in a denial of service.
( CVE-2021-20277 )
Douglas Bagnall discovered that ldb, when used with Samba, incorrectly
handled certain DN strings. A remote attacker could use this issue to
cause the LDAP server to crash, resulting in a denial of service, or
possibly execute arbitrary code. ( CVE-2020-27840 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o libldb2 - 2:2.1.4-2ubuntu0.1
Ubuntu 20.04
o libldb2 - 2:2.0.10-0ubuntu0.20.04.3
Ubuntu 18.04
o libldb1 - 2:1.2.3-1ubuntu0.2
Ubuntu 16.04
o libldb1 - 2:1.1.24-1ubuntu3.2
After a standard system update you need to restart applications using ldb,
such as Samba, to make all the necessary changes.
References
o CVE-2021-20277
o CVE-2020-27840
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